A186868 Number of (n+1)X3 0..2 arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums

171, 2121, 24414, 285724, 3409112, 40893800, 492154924, 5938127608, 71755699992, 868144018572, 10511898062464, 127364674658272, 1543896563706688, 18721690171445596, 227085751983499944, 2755034034648413220

Offset

1,1

Comments

Column 2 of A186871

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 5X3
..0..1..1....0..0..1....0..1..0....0..1..2....0..2..0....0..1..0....0..1..2
..2..1..1....1..2..1....2..2..0....1..1..2....2..2..0....1..1..1....1..2..0
..1..0..0....0..0..1....1..0..1....0..1..2....0..2..0....2..2..2....0..1..2
..0..2..0....1..2..1....0..2..0....2..2..2....0..1..0....0..2..0....2..1..2
..0..1..0....2..1..2....0..2..0....0..1..2....1..0..1....2..0..2....2..1..2

Crossrefs

Sequence in context: A185838 A199902 A251223 * A185611 A195279 A370299

Adjacent sequences: A186865 A186866 A186867 * A186869 A186870 A186871

Keyword

nonn

Author

R. H. Hardin Feb 27 2011

Status

approved